The Linkbasic UTP Cable Tester is an essential diagnostic tool for inspecting and verifying network cables, including LAN RJ45 and RJ11 connections. Engineered to test both unshielded (UTP) and shielded cables, it easily identifies open circuits, shorts, reversals, and mis-wiring. The main unit and its companion remote terminal feature cyclic, sequential LED indicators that flash one by one to help you quickly determine correct pinouts or find wiring errors.